从新浪网学习到的ajax类

function class_ajax(){this.ID = "ajax";/** * xml请求对象 */this.xmlHttp = null;/* * 请求的目标url */this.url = "";/** * http请求的方法 GET or POST */this.method = "";/** * 状态改变的事件触发函数 */this.event = "";/** * 是否为异步连接 */this.async = true;/** * REQUEST参数 */this.params = new Array;/** * 初始化xmlHttpRequest对象 * */this.init = function(){ if(this.xmlHttp == null) { if (window.XMLHttpRequest) { this.xmlHttp = new XMLHttpRequest(); } else if (window.ActiveXObject) { this.xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); if(!this.xmlHttp) { this.xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); } } } if(this.xmlHttp == null) { alert("invalid xmlHttpRequest!"); return false; }}//end function/** * 设置目标请求方法 */this.set_method = function(method){ if(method != 'POST' && method != 'GET') { alert("invalid method!"); return false; } this.method = method;}//end function/** * 获取目标请求方法 */this.get_method = function(){ return this.method;}//end function/** * 设置状态该表要触发的事件 */this.set_event = function(event){ this.event = event;}//end function/** * 获取 event */this.get_event = function(){ return this.event;}//end function/** * 设置要请求的目标url */this.set_url = function(url){ this.url = url;}//end function/** * 获取 url */this.get_url = function(){ return this.url;}//end function/** * 添加REQUEST 参数 */this.add_param = function(key, val){ var tmpCount = this.params.length; this.params[tmpCount] = key + "=" + val; }//end function /** * 设置请求为异步连接 */ this.set_async = function() { this.async = true; }//end function /** * 取消异步连接，即设置为同步连接 */ this.set_sync = function() { this.async = false; }//end function /** * 发送请求 */this.submit = function(){ this.xmlHttp.onreadystatechange = this.event; var send_params = null; if(this.params.length > 0) { send_params = this.params.join('&'); if(this.method == 'POST') { this.xmlHttp.open(this.method, this.url, this.async); //this.xmlHttp.setRequestHeader("Method", this.method + this.url + " HTTP/1.1"); this.xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); this.xmlHttp.send(send_params); }else { this.xmlHttp.open(this.method, this.url + "?" + send_params, this.async); this.xmlHttp.send(null); } }else { this.xmlHttp.open(this.method, this.url, this.async); this.xmlHttp.send(send_params); } }//end function/** * return Data * @param string type : "xml" or "text" */this.get_content = function(type){ if(type == 'xml') { return this.xmlHttp.responseXML.documentElement; }else { return this.xmlHttp.responseText; }}/** * 检测事件是否完成 */this.complete = function(){ if(this.xmlHttp.readyState == 4) { return true; } return false;}//end function/* * 检测请求是否成功 */this.success = function(){ if (this.complete() && this.xmlHttp.status == 200) { return true; } return false;}//end function/** * 获取消息提示 */this.get_statusText = function(){ return this.xmlHttp.statusText;}//end function}//end class

 

//ajax类实例 var Ajax = new class_ajax(); Ajax.ID = "buyTools"; Ajax.init(); Ajax.set_method("POST"); Ajax.set_event(Guess.buyToolsCallBack); //参数不能加引号 Ajax.set_url("/iframe/guess_srv.php?action=buy_tools"); Ajax.add_param("single", single); Ajax.add_param("group", group); Ajax.add_param("_t", new Date().getTime()); Ajax.submit();